November 30, 2020 — When Chatham commercial fisherman Bruce Kaminski took Lt. Gov. Tim Murray and other state officials out fishing in August 2008, he hoped to prove the spiny dogfish were overrunning their fishing grounds and inhibiting the restoration of more valuable species such as cod.
That day, Kaminski and his crew caught 300 dogfish on 300 hooks in a scant 10 minutes. It was a sign that dogfish populations were rebounding from low numbers in the late 1990s. Cape fishermen were asking that their daily catch limit of dogfish be increased from 600 pounds per day to something closer to the 7,000 pounds per day they caught in the early ’90s.
Dogfish have since rebounded to relatively healthy levels, and fishermen are now allowed to catch 6,000 pounds per day, but they say the dogfish comeback happened at the expense of cod, which are still mired at all-time low population levels.
There are many reasons for the lack of success reviving the cod population — chronic overfishing, a rapidly warming ocean and insufficient habitat protection, to name a few. But fishermen told scientists for decades they think an imbalance in the ecosystem, brought on by a resurgent dogfish population, shares a good portion of the blame.
Fishermen say they have witnessed dogfish eating cod, but that’s been hard to quantify. From 1977 to 2017 only 14 cod were found in the stomachs of dogfish caught in NOAA’s annual bottom trawl survey that involves random sampling using a fishing net in waters from Cape Hatteras to the Canadian border.